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针对新版gre数学复习，将每天为大家整理一个重要考点，希望大家能够将这些重要考点系统地记住，在考试中取得一个好成绩，突破新gre数学困境。 新版gre数学复习重要考点：Sum of Arithmetic Progression（数列求和） The sum of n-numbers of an arithmetic progression is given by S=nxdn（n-1）/2 where x is the first number and d is the constant increment. example： sum of first 10 positive odd numbers:101+2109/2=10+90=100 sum of first 10 multiples of 7 starting at 7： 107+7109/2=70+315=385 remember： For a descending AP the constant difference is negative. 由于美国数学基础教育的难度增加导致数学考试越来越难，但新gre数学复习考点都是高中时候学到的知识点，考生不要过于紧张，把基本概念弄明白，再记住一些新版gre数学必备的词汇，那么相信新版gre数学应该没有问题。 AP Average of n numbers of arithmetic progression （AP） is the average of the smallest and the largest number of them. The average of m number can also be written as x + d（m-1）/2. Example： The average of all integers from 1 to 5 is （1+5）/2=3 | 
